[LLVMbugs] [Bug 209] [loadvn/inline/scalarrepl] Slow optimizations with extremely large basic blocks
bugzilla-daemon at cs.uiuc.edu
bugzilla-daemon at cs.uiuc.edu
Thu Feb 5 09:29:52 PST 2004
http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=209
sabre at nondot.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|REOPENED |RESOLVED
Resolution| |FIXED
Summary|[loadvn/inline/gcse] Slow |[loadvn/inline/scalarrepl]
|optimizations with extremely|Slow optimizations with
|large basic blocks |extremely large basic blocks
------- Additional Comments From sabre at nondot.org 2004-02-05 11:29 -------
Okay, with this final patch:
http://mail.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20040202/011170.html
The optimizer is finally able to handle the testcase respectably, taking ~2s to
optimize it (as opposed to ~300s originally). I now get the following
-time-passes output:
Total Execution Time: 2.0800 seconds (2.0652 wall clock)
---User Time--- --System Time-- --- Name ---
0.8200 ( 39.6%) 0.0099 (100.0%) Function Integration/Inlining
0.5100 ( 24.6%) 0.0000 ( 0.0%) Global Common Subexpression Elimination
0.4699 ( 22.7%) 0.0000 ( 0.0%) Scalar Replacement of Aggregates
0.0599 ( 2.8%) 0.0000 ( 0.0%) Bytecode Writer
0.0500 ( 2.4%) 0.0000 ( 0.0%) Combine redundant instructions
...
For reference, 'g++ -O2' takes 91s on the same testcase (with GCC 3.3).
-Chris
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